Archives for August 10, 2015

DataTerminals – Predecessors of Personal Computers, Part 2 of 2: HP 2647A


Brochure Photo of the HP 2647A Intelligent Graphics Terminal

Alumni Memories from Pam (Thebeau) Leitterman

The top of the line end-user product for the 264X series was the 2647A Intelligent Graphics Terminal.  It made its debut in May 1978 and listed for $8300. It came with a BASIC interpreter, a Multiplot program for creating line, bar, and pie charts, and an HP Slide program for making text-based overhead transparencies using an HP plotter.   Incredibly slick technology for its day, but for those of us now accustomed to projecting powerpoint slides from a laptop, it’s hard to imagine the number of hours and manual attention it used to take to create a 30-page slide deck when you had to align each single transparency on a plotter, start the 4- or 8-pen plotting action, remove the plotted transparency, and then wait for it to fully dry before inserting it into a 3-hole sleeve.   I’m sure I plotted hundreds of slides in my early years at HP.

Here’s a diagram of the input screen for HP Slide followed by a sample of the plotted output from that screen. Notice on the input screen, there was a column labeled “Pen#.” This was the function that allowed text to be in different colors.   Though you could arrange the plotter pens in any order, it was typical to put the black pen in the #1 spot, the red in the #2 spot, the blue in the #3 spot, and the green in the #4 spot. In the example shown below, only pen #1 is used.


HP Slide – Sample Input


HP Slide – Sample Output

More information about the HP2647A Intelligent Graphics Terminal can be found at, a website with links to over 32,000 documents for over 500 companies / organizations. Specific HP2647A documents include:

Related Post:  Data Terminals — Predecessors to Personal Computers,  Part 1 of 2:  HP 2640/44/45

Pam Leitterman
BS Applied Mathematics, 1975
Co-chair CS Golden Jubilee Steering Committee
President, Academy of Computer Science

DataTerminals – Predecessors of Personal Computers, Part 1 of 2: HP 2640/44/45


Pam Leitterman at her desk in HP’s Data Terminals Division, Bldg 43U, in 1979. The new Apple campus is being constructed on the former HP site on Homestead Road in Cupertino, CA where Bldg 43 and other HP buildings were located.

Alumni Memories from Pam  (Thebeau) Leitterman

In July 1979, I embarked on an almost 28-year career with Hewlett-Packard. In my first job, I was a technical marketing engineer for HP’s Data Terminals Division (DTD).   One of my primary responsibilities was to train HP Systems Engineers (SEs) on DTD products. HP was booming then and hiring systems engineers at an incredible rate.   For several years we conducted new hire SE training on our products almost every other week, 20+ SEs at a time.

I supported and delivered training on the 264X terminals. They all featured an 8080 (8-bit) microprocessor and a 15-slot backplane that allowed them to be configured and sold as a series of products with varying degrees of capability. For training purposes, the modularity enabled us to swap out PC boards and key caps to provide hands-on experience with the full product line over a period of several days. Initially, we weren’t aware we might be causing problems for the products due to electrostatic discharge (ESD) that could occur from swapping boards in and out with our bare hands. Later, we learned to wear protective gloves and store our training circuit boards in anti-ESD packaging.

HP’s data terminals were primarily used as consoles and data entry devices for computers. However, the terminals also had enough display memory and intelligence that they could be used as standalone word processing devices. In DTD, we often used them this way to create memos and short documents that we printed to an attached daisy wheel printer, saving our data on the mini cartridge tape drives that were available on most of the product line. Each data cartridge could store a whopping 110,000 bytes of information!

The 2640A, the first of the 264X terminals from HP was introduced in 1974. It displayed 25 lines of text (80 columns) on its five by ten inch rectangular screen. It initially sold for $3500 but a discounted price of $2640 each was offered for quantities of six.


Ad for HP 2640A terminal, Dec 1974. Click picture for full size view.

The 2644A was introduced in 1975 for $5000 and included two mini cartridge tape drives. The 2644A was replaced by the 2645A ($3,500 without tape drives, $5,100 with two tape drives) in 1976. The 2645A was the most common of the 264X terminals.


Ad for HP 2645 terminal, 1976. Click photo for full page view.

Thanks to (a private museum based in Australia and not affiliated with the Hewlett-Packard Company) for refreshing my memory on facts and features of the 264X terminal line, and for the old ads which are posted on their web site.

Related Post:  Data Terminals — Predecessors of Personal Computers, Part 2 of 2:  HP 2647A

Pam Leitterman
BS Applied Mathematics, 1975
Co-chair CS Golden Jubilee Steering Committee
President, Academy of Computer Science

Registration for Homecoming, Oct 22-24, 2015 is Now Open!

minerfest_homecomingOur Computer Science Golden Jubilee celebration kicks off at the MinerFest Homecoming, Oct 22-24, 2015 in Rolla, Missouri.  A complete list of homecoming activities for all organizations can be found at: .  A link to registration can also be found at the same page.  Some Homecoming events require reservations.  Others do not.

Two Golden Jubilee events require advance reservations.  Please use the registration link on the page to sign up for these events.

Arlan DeKock Recognition Dinner
Thursday, October 22, 2015
Comfort Suites Inn Banquet Room
Reception at 5:00 pm.  Dinner at 6:00 pm.
Cost: $30 plus no-host bar

Golden Jubilee Speaker Series Launch
with Entrepreneur, Tan Le, CEO & Founder of Emotive Lifesciences
Friday, October 23, 2015
Leach Theatre, Castleman Hall
Doors open at 2:30 pm.  Presentation begins at 3:00 pm.
Video of Hackathon for Humanity projects immediately follows the Tan Le presentation/Q&A (~4:15 pm)
Cost:  Free, but reservations for tickets are required.
Pick up your tickets at the Leach Theatre Box Office, M-F, Oct 14-23.

See for additional Golden Jubilee events that do not require reservations.